1 . irregular
Through regular and irregular work continuously to meet the various needs of users ., 通過定期和不定期地開展工作 , 不間斷地滿足用戶的各類需求.
2 . aperiodicity
aperiodically 不定期地aperiodicity 不定期aperitif 開胃酒
3 . occasionally
Number of Vehicles 汽車數(shù)量occasionally 不定期Occupation 職業(yè)